PlantingWindowThe American Planting Almanac

Cheyenne, Wyoming: freeze dates & growing season

Three different things get called “Cheyenne” here, so this page is explicit about all three: the metro label (Cheyenne), the anchor geography (Census ZCTA 82001, a downtown ZIP-code area), and the climate record (the NOAA station below). Windows are calculated from the station — not from your street address.

Climate basis: NOAA station Cheyenne Wfo, WY (USC00481676), 7 mi (12 km) from the ZCTA 82001 centroid, elevation 6119 ft, on the 1991–2020 climate normals.
Last spring freezeMay 141-in-10 after May 28
First fall freezeOctober 11-in-10 before Sep 17
Frost-free season≈ 139 daysmedian at 32°F
Hard freeze, 28°May 3 – Oct 10kills even hardy greens
USDA zone5b-15 to -10°F winter low — not frost timing

The year

  • indoors under lights
  • in the garden
  • frost-free season
  • 1-in-10 years still freeze to May 28
The Cheyenne year: hatched areas are the freeze-likely seasons in 1991–2020 normals.
What that means in practice
All 79 crops in Cheyenne

These windows describe typical years (1991–2020 climate normals), not this year's forecast. Freezes happen outside them — especially in frost pockets, valleys, and urban edges. Watch the forecast before committing tender plants.

Check a specific ZIP instead

Metro climates vary — elevation, water, and urban heat shift freeze dates by days to weeks. Look up your exact ZIP:

Nearby reviewed metros

Denver, CO · Colorado Springs, CO · Billings, MT · Salt Lake City, UT · Albuquerque, NM